Rotary hammer.



N. P. RlDGWAY.

` ROTARY HAMMER.

APPLICATION FILED ocT. I8. Is'Is.

1,21 6,l66 E Pmntea Feb. ISI?.

@entre i treiteraars l5 Q l!) nel. .LL. aan.; metall-ela dat? iraniana.

Lafraise.,

rotary hammers, 'and the'object of the iiniorovement is to prow/idea strong., simple and elicient device of this class that is adapted i when it `-is rotated to 'strike `lolov'vs in rapid succession.' l y The invention consists in the novel construction, adaptation land combination of parte as will be more fully described in the following specification, illustrated in the accompanying drawings and nally pointed out in the appended claims.

ln the accompanying drawings Figure 1 is a View in vertical section of a rotary hammer embodying my inventionylig. 2 is a view in cross section on broken line 2, 2 of Fig. 1; Fig. 3 is a fragmentary View in cross section illustrating an operative position o a ham-- mer element; Fig. e is a fragmentary sec tional View on broken line t, f of Fig. 1 and Fig. 5 is another fragmentary sectional View on broken line 5, 5 of Fig. 1. v

- Referring to the accompanying drawings throughout which like reference numerals indicate like parte, the numeral 6 indicates a circular casing that is provided on one sidewith a handle 7 of any convenient torni anden another side with a hollow extension 8' within which is slidably disposed the Shank 9 of a riveting tool or other instrument that isadapted to he struck a plurality of blows in rapid succession. 4

Concentrically disposed 'Within the casing 6 and adapted to rotate on a shaft l0 is a hammer body'll that is provided with one or more hammer elements 12 as clearly shown in Fig. l and is adapted to be rotated by an induction motor consisting in a stationary armature 13 that is secured to the casing 6 and a rotating field 11i that is secured to the hammer body 11 as illustrated diagrammatically in Figs. l and 2, the motor being connected by electric circuitw-ircs 15' with a source of supply ot' electrical current, (not shown). i A

The hammer elements 12 are slidahly 'mounted within holders 16 that are secured to thefhammer body 11 in any suitable manner as by screws 17 and such hammer elen 'l specification of Letters Patent.

. application lcd Gctoter 1S, 19M. Serial No. 58,633.,

Patented lllela.. la., ai

-niente are adapted to work against rollers 18 that are\disnosed with their ends in slots 20 in the holders 1G whereby the hammers may slide more easily Withi. the holders.

'lhe hammer 4eleniients 12 arc limited in their outward movement hy stops 21, for ,led

integral with-the sides ltl'joi" the holders 1G,

as more clearly illustrated'in Figs. 4; and

to prevent such elements 12 from coming in Contact with the casingli,

ln operation the device is set up is shown in land electrical current is supplied to the motortc rotate the hainmer rection indicatedhy the arrow A.

The radial lines oi' the hammer body il that pass through thecenters of gravity of the hammer elements 12 are always inclined with respect to the direction of movement of the elements 12- within the guides 16, hence when the device is rotated in the direction indicated hy the arrow A centrifugal force acting outwardly on such radial lines will cause the hammer element to press against the inclined surface formed by the rollers lil .inthe diand suchelements will be constantly held outward into the position shown in Fig. l.

As the hammer body l1 rotates the hamincr elements 12 will be moved by centi-iin gal force to the limit of their outward Inoveinent and each 'time they pass the end of the tool 9 will strike a blow thereon. wllhen the hammer element 12 strikes the tool 9 the tool will be driven outward by the impact of: the blow and the hammer will oe moved back into the casing 16 as shown in Fig. 3, the air in the rear of such casing serving as a cushion to'prevent the rear end of' the hammer from battering the rear end wall of the casing. V.as soon as the element 12 is released by the tool 9 centrifugal force wil` cause it to again move outward into the position shown in liig. 1.

The rollers 18 facilitate the movement of the hammer elements 12 and insure 'that auch elements will not bind on the walls of the guides 16 although it has been. found in practice that such rollers are not necessary.

icc

Having described my'invention what d'. f

claim is:

1. A device of the class described coniv a position to strike a blow on said tool when said body member is rotated.

2. A device of the class described, comprising a rotatable body member, a guide associated with said body member, rollers provided in said guide, a hammer element movable longitudinally in said guide and means associated with said guide for limiting the outward movement of said hammer element.

El. A device of the class described, com prising a casing having a tool mounted therein, a rotatable body member, a guide associated avith said body nicn'iber, and a hammer -@lenient movable in said guide in a direction that is inclined to the plane of the radial line joiningthe center ot' rotation ol said body member and the center o'i gravity of said hammer element, whereby when said body member is rotated in one direction said hammer element will be held at thc .limit ol its outward movement.

l. A device of the4 class described oomprising a casing, a body member mounted for rotation therein, a tool, means for rotating said body member, guide members associated with said body member, hammer elements movable in said guide members in a direction thatis inclined to the direction of the radial lines joining the center of rotation ot' said body member and the centers of gravity ot said hammer elements whereby when said body member is rotated said hammer elements will be moved outwardly, and means for limiting,` the movement of said hammer elements within said guides.

5. A hammer of the class described, comprising a easing, a body member mounted Sli for rotation within said casing, a tool hold- (3. A portable self contained hammer com` prising a circular casing', a tool slidably mounted therein, an annular body member mounted for rotation within said casing, a motor disposed within said body member,

guideways provided in said body member substantially in tangential relation thereto,

roller bearings in said guideways, hammer elements movable in said guideways and operable on Asaid tool, and stops on said guidmvays tfor said hammer elements.

Signed by me at Tacoma, ashington, this 25th day ot' Aug., 191.3.

NELSON P. RIDGWAY.

Witnesses l-l. G. Ran'r'ric BEN. L. Moolen. 

